[mrennie]

I don't have an answer for your problem but i do have a similar well setup - 385' deep with pump at 250'.

Have had to pull pump once due to no water and found the power wires were not taped to the poly pipe and had worn through and shorted out to casing. Too bad we pulled the entire thing out and found the wire issue was 40' from ground level.

On my system I have a check valve at the pump, and another check valve just before the tank. The local water pump guy recommended this to help in case the check valve at the pump went bad or there was a leak between the pump and tank, it helps prevent the water draining back into the well.

Pulling the pump took 2 guys, and finding a place to lay out 250' of pipe/wire as you are pulling it out needs some thought.

Also, think about sanitation when you put the pump/pipe back in. It is highly likely that coliform bacteria will be introduced to the well after having the pipe laying on the ground for any length of time. (It happened to me). Sanitizing will require pouring bleach into the well and circulating it throughout the the house and back to the well (using a garden hose) until you know the bleach is in the system, then waiting several hours before pumping the well down until the bleach is gone. I can't remember the required bleach concentration (Google it) but I do recall this part is a PITA.